Automatic telephone signaling apparatus



Sept. 25, 1934. J E TUSCHER ET AL 1,974,551

AUTOMATIC TELEPHONE SIGNALING APPARATUS Filed Dec. 5, 1932 6Sheets-Sheet l INVENTORS \Jan Zf'Taqcze/ 67 BY Mame/5,000

ATTORNEYS S P 1934- 'J. E. TUSCHER El AL 1,

AUTOMATIC TELEPHONE SIGNALING APPARATUS Filed Dec. 5, 11932 6Sheets-Sheet 2 INVENTORS Jean, EJ256130 4 /Varcel Jpzm OM I 9 M 1 M9ATTORNEYS Sept- 25, 193 J. E. TUSCHER ET Al. 1,974,551

AUTOMATIC TELEPHONE SIGNALING APPARATUS Filed Dec. 5, 1932 6Sheets-Sheet 5 Sept. 25, 1934. J, E. TUSCHER ET AL AUTOMATIC TELEPHONESIGNALING APPARATUS Filed Dec. 5, 1932 6 Sheets-Sheet 4 INVENTORS flan E172156502 4 Marvel 6p z'ro,

ATTORNEYS Sept. 25, 1934. J. E. TUSCHER ET AL AUTOMATIC TELEPHONESIGNALING APPARATUS Filed Dec. 5, 1952 pd, M 7 Se 1 m H a W m 4 N WT I;A 1; MM D W A W Y; s l BM W M 7 M A WI M m a m H k; H H m M w 7, U H 2 Wm A fi. m o W Sept. 25, 1934.

J. E. TUSCHER ET AL AUTOMATIC TELEPHONE SIGNALING APPARATUS Filed Dec.5, 1932 6 Sheets-Sheet 6 INVENTOR 5 JQ?1.,Z', Tus cZer 4 BYMarce Z,Jpzra GM, ,Dw W ATTORNEYS Patented Sept. 25, 1934 AU'roMA'rrc TELEPHONESIGNALING APPARATUS Jean Edouard Tuscher, Petit Ivry, and Marcel Spiro,Paris, France, assignors to Societe de LAvertisseur TelephoniqueAutomatique, Paris, France, acorporation of France Application December'5, 193e, Serial No. 645,846 In France December 9, 1931 16 Claims.

This invention relates to protective alarm systems for buildings,adapted automatically to transmit an alarm message telephonically, andmore especially to systems of this character capable of operating inconjunctionwith a subscribers telephone line terminating at an automaticexchange.

An object of the invention is the provision of a protective system forassociation with a dial actuated subscriber's telephone line which, uponoccurrence of conditions requiring that an alarm be given. willautomatically dial a preselected station and transmit an alarm messagephonographically thereto. 1

A feature of the invention is the optional incorporation therein ormeans whereby the alarm apparatus will dial in sequence two or morepreselected stations and transmit the alarm message phonographicalLv toeach. This same modification permits of calling stations several timesin succession to guard against the contingency of a busy line.

The apparatus whereby these results are achieved is reliable ofoperation and 01 compact structure. The employment therein of amicrophone pick-up for translating the stylus vibrations directly intoelectrical oscillations, assures such silent operation in giving thealarm as not to warn an intruder. To further this end the alarmmechanism which is separate and apart from the subscriber's telephoneset, may be housed in a sound-proof casing, and placed out of sight, asfor example, in a desk drawer, etc.

In the drawings Fig. 1 is a composite showing or the electricalprotective circuits and cooperating mechanical features illustrating theprinciples of operation for a modification oi the invention actuatedfrom an electrically driven motor. I

Fig. 2 is a sectional elevation of the dialling mechanism incorporatedin the Fig. 1 structure.

Fig. 3 is a wiring diagram showing the manner in which the diallingmechanism and phonographic message transmitting device of the protectivesystem are associated with a subscribers telephone line extending to anautomatic 'exchange.

Figs. 4-13 inc. show a second modification oi the invention actuated bya mechanically driven motor.

Figs. 4 and 5 show in plan view and sectional elevation the mechanicaldetails of this construction.

Fig. 6 is a wiring diagram of the telephone connections.

Fig. '1 is a detail showing the'mechanical features of the startingdevice.

Figs. 8 and 8a are details illustrating the mechanism for stopping thedevice.

Figs. 9 and 10 are respectively an elevation and a sectional elevationof the cam actuated dialling mechanism.

Fig. 11 illustrates an individual dialling cam, and Fig. 12 an annularblank insert for separating the dialling cams. V

Figs. 13 and 14 are respectively a circuit diagram of the telephoneconnections, and a longitudinal elevation partly in section showing themechanical features 01' a modifle'd construction of the diallingmechanism whereby alarm messages may be sent to several stationssuccessively.

Figs. 15, 16a and b, 17a and b, and 18a and b, show in plan view andelevation, the components of the cam assembly incorporated in the Fig.14 construction, for breaking the microphone cir-' cuit betweensuccessive calls, and for actuating the dialling mechanism at properintervals in the desired sequence. Fig. shows the collar upon which areassembled the cams Figs. 16 and 18 separated by insert blanks Fig. 17.

Figs. 19a and b show in plan view and sectional elevation, airusto-conical insert member of the repeat call dialling mechanism ofthe Fig. 14 assembly.

In the embodiment of the apparatus illustrated in Figs. 1 to 3, theprotective circuit 101 is normally closed by a plurality of switches 102located at various points on the premises to be protected and which willbe opened in the usual way when such premises are invaded. Theprotective circuit 101, energized irom a source of electrical powersupplied to terminals 100, and controlled by a switch 103 having an oilposition 104, normally energizes an electromagnet 105 to open a switch106 closure of which completes a circuit over conductor 107 through anelectromagnet 108 which, when energized, starts the signaling apparatusin a manner presently to be described. AlternativeLv energization ofelectromagnet 108 may be under control of normally open protectivecircuits such as those including switches 109 and 109', adapted to beclosed upon entry of an in- I the phonographic record, cylinder or stripon which is recorded a. suitable message of warning to the stationdialed that the protected premises are being invaded.

The spindle of the dialling device is axially displaceable. To permitthis, its upper end is splined in a quill portion of the spindle 1130fthe speed reducer and is driven by said spindle 113 through the mediumof a pin 116 mounted in an axial slot of the spindle 113. The lower end117 of the spindle 115 is threaded and screws in a socket 118 fixed tothe frame of the apparatus.' The movement of the spindle of the diallingdevice is therefore the combination of a rotational one imparted by thespindle 113 of the speed reducer, and a vertical translational movementcontrolled by the threaded socket 118.

When the spindle 115 has reached the position illustrated in Fig. 2, itsdriving finger 116 clears the spindle 113 so that movement of saidspindle 115 then ceases. To return the dialling device to its initialposition, it is only necessary to screw the socket 118 until spindle 115is returned to its position shown in Fig. 1. The spindle 115 of thedialling device carries one or more dialling cams 119'and a drum 120 towhich are imparted its combined rotational and translational movement.

In Fig. 3, wiring diagram showing the telephone connections, 121represents the conventional wiring of a subscribers telephone stationarranged for dialling. The subscriber's station is connected overconductors K to an automatic telephone exchange.

The alarm system is connected at a convenient point to the subscriber'sline It over conductors 122, included in a circuit traced seriatumthrough contacts of a normally open switch 123, normally closed contactsof switch 126b, controlled by the aforementioned drum 120, and normallyclosed contacts of switch 126b, actuated by the dialling cam .19,whereby dialling impulses may be transmitted to line It from the alarmsystem. Closure of switch 123 is effected during rotation of motor 111,through lateral displacement of the slideblock 124 afiixed to thecentrifugal governor 125, thus connecting the alarm apparatus to line k.During the dialling operation the contacts of switch 126a are maintainedclosed by drum 120 in the manner shown in Fig. 1, thereby to shortcircuit the microphone pick-up 127 of the phonograph mechanism as shownin Fig. 3. Upon completion of the dialling, however, the axial advanceof drum 120 opens switch 126a in the manner of Fig. 2, to connect themicrophone pick-up 127 in the circuit traced over conductors 122 inorder that the alarm message may be transmitted to line It and thence tothe station dialled.

Automatic operation of the system to dial a selected station andtransmit the alarm message thereto are effected as follows: The alarmmechanism having been set by closure of switch 104, entry of theprotected premises opens a switch 102, or closes a switch 109, toenergize relay 108 in the manner described. The motor 111 having beenstarted by actuation of lever 110 upon energization of electromagnet108, the axial displacement of the slide block 124 due to rotation ofthe centrifugal governor 125, closes switch 123 to complete the circuittraced from line k through the dialling switch 126b. Current from thecentral oflice then flows from one side of line is through switches126aand 126b, both of which are closed, and returns to the other side ofline It, the microphone pick-up 127 being thus shortcircuited. As theteeth of cams 119 in their combined rotational and translationalmovement pass successively under the push button of switch 126b, thetelephone circuit is opened a predetermined number of times and in adialling sequence adapted to establish connection with the station to becalled. The dialling impulses are controlled by the number, shape andlocation of the teeth on each campthe number of cams, the speed ofrotational and translational movement, etc.

If the telephone is of the automatic exchange type, the cams 119 and thedrum 120 are designed in such manner as to call the required number, i.e. to reproduce automatically the dialling operations of the manualdialling device of the subscriber's telephone set 121. If, however, thetelephone is of the manual exchange central oflice battery type, thedialling cams are not required for the reason the direct current pathestablished between the conductors of line k upon closure of switch123,will light the pilot lamp before the central oflice operator, and shewill answer in the usual way to complete the call to the desired stationin accordance with instructions transmitted phonographically from themicrophone pick-up 127.

In the modification illustrated in Figs. 4 to 13 inclusive, the motor ofthe apparatus is a mechanical motor whose spring is lodged in thedrum 1. The spring re-winding mechanism is shown at 2. The wholeapparatus is mounted within a casing 3 which may incorporate a soundproofing material. The crown wheel 4 of the drum drives the variousmechanisms of the apparatus through a gear train 5-6, 7-8, 9 and 10. Thespindles of the drum and gears are mounted between two mounting plates11 and 12 which are braced by three struts 13 resiliently mounted on thecasing 3 of the apparatus.

The signaling apparatus operates'as follows: When'one of the contacts102 and 109 of the protective circuit illustrated in Fig. 1 is actuated,the electro-magnet 14, Figs. 4, 5 and 7, is energized and attracts itsarmature 15 which, through the medium of the pivot lever 16, releasesthe drop 17, the latter as it falls, depressing the rod 18 below thestop pin 20 fixed on the ledge of the tumtable 19 of the phonograph,thus initiating operation of the entire mechanism. The turntable 19 seton the spindle of the pinions 7 and 8 being released, the spring ofthedrum 1 unwinds driving the various members of the apparatus through therotation of the crown wheel 4 and of the pinions 56, 78, 9 and 10.

The telephone connection, Fig. 6, is made for example at any suitablepoint of the telephone line 1:: extending from the subscriber's set 21to an automatic exchange. When the driving motor of the protectiveapparatus is stationary, the circuit of the subscriber's telephone is byway of k, b, c, I, that is, through the contacts b--c of the twowayswitch b c d of the signalling apparatus. The two-way switch b c d iscontrolled automatically by the slide block it of a centrifugal governor21.

When the motor of the apparatus is started up by the means previouslydescribed,the slide block h of the governor rises and lifts the pushbutton 22 of the contact blade b. The first circuit 1; b c l to thesubscriber's telephone is then broken while the slide block h,continuing on its upstroke, establishes contact between the two upperblades b d of the telephone line is extending from the central oflicebeing then closed by way of k b d having a helicoidal motion.

The dialling device n illustrated in Figs. 9 and 10, is at thisinstantin the position of Fig. 9 in which it holds the switch e f 9closed by acting on the push button 23. When, after several secondsrotation of the dialling device 11, the push button 23 of the switchencounters the sets of dialling cams 24, the contacts I g are broken aseach cam tooth passes under the push button 23 at the required rate toactuate the selectors of the exchange, and consequently to call thenumber of the emergency station sought for.

During the dialling operation, however, contacts e f remain closedthereby short-circuiting the microphone pick-up m of the phonograph.

When the dialling operation is terminated (position shown in Fig. 10)the contactsf g of switch e f 9 remain closed, whereas the contactse ,fare broken, thus establishing the microphone pick-up circuit is b d r' mj g k. To avoid arcing at the contacts I 9 during the operation thedissipative circuit, comprising condenser 10 in series with dampingresistance r, is arranged in shunt thereto as shown. p

-The adjustable resistance r is inserted in the circuit of themicrophone pick-up m to adjust, according to the resistance of the lineand the voltage of the exchange battery, the signal intensity reproducedat the called station.

As soon as the emergency signal has been emitted for a predeterminedtime, the motor is stopped by means presently to be described. The slideblock h of the governor 21 then returns to its position of rest, firstbreaking, the microphone circuit k b d r m f g k, and then remaking thesubscribers telephone circuit k b c l k, whose line is released.

The spindle 25 of the dialling device 11, Fig.- 10, rotates atpredetermined speed in a tapped guide member 26, mounted on the mountingplate 12. It is driven by the pinion 9 through the toothed wheel 6 androtates in an adjustable step bearing 27. The dialling device 1:. isconstituted by a cylindrical member to which a helicoidal movement isimparted through the medium of a pin 28 secured tothe spindle 25, saidpin sliding in a suitable slot of the dialling device n. The pitch ofthe helix is determined by the thread of the support 26 onto which thedialling device 11. is screwed in such wise that the push button 23 ofthe switch e f g is pushed back successively by each tooth 4 of theearns 24. Said cams 24 are so cut out that the digit 0, comprising aseries of ten interruptions, occupies half the circumference of anindividual cam, Fig. 11.

In this manner, between each set of interruptions corresponding to thedigits of the number called, there occurs between successive digits, aclosure (minimum for the digit 0') of the circuit k b d e f g k (Fig. 6)corresponding to an interval of at least half a revolution of.

the dialling device 11..

The dialling device n includes as many'dialling cams 24 as there aredigits in the number of the station called. Each cam is separated fromthe next one by an insert member 29, Fig. 12. The cams and their insertpieces are centered on the dialling device 12 and are clamped by a screw30,

When, after dialling, the dialling device is arrested in the position ofFig. 10, the circuit k b d r m f g k is established. The microphone ofthe phonograph pick-up m is of standard construction. It is mounted in acasing 31 by means of a screw 32 at the end of an arm 33, mounted toswivel in all directions on a pivotal support 34 carried by the plate 12as shown in section in Fig.5.

'A phonograph diaphragm stylus support is mounted on the casing 31. Thesound vibrations transmitted by the emergency signal call recorded onthe record 36 are transmitted to the carbon membrane 37 of themicrophone m by the screw 38 of the support 35 which bears on the carbonmembrane through the medium of a leaf 39 with a pressure that can beadjusted. The screw 38 passes through a resilient membrane 40 aflixed tothe bottom of the casing 31, which membrane attenuates stray vibrationsin the telephonic transmission of the call recorded.

The call is recorded on the surface of the record 36 for a widthcorresponding to a revolution of the drum 1, that is to say,approximately 40 turns for the apparatus illustrated herein. When theneedle has traversed these forty turns, a finger 41 fixed on a cursor'42 of the arm 33 encounters a cam 43 rotating with the drum 1. Said cam43 is slotted so that in passing under the finger 41 it raises themicrophone and rotates it untilthe needle 44 of the record returns toits starting position on the record 36. The call recorded is thusrepeated at eachrevolution of the drum 1. By causing the cursor 42 v torotate and slide on the arm 33, the lift and angular displacement of theneedle 44 of the microphone are adjusted. The knob 45 enables the corsor42 to be clamped on its spindle.

To restrict the telephone signal to a predetermined time duration ornumber of signals, the drum 1 carries laterally one or more fingers 46which drive a ratchet wheel 47 (Figs. 8 and 8a) mounted on a spindle 48provided with a tapped head 50 which screws into a support 49 fixedunder the upper plate 11. When thescrew head 50, abuts the plate 11, theratchet 47 arrests the driving finger 46 and hence the drum 1 and thewhole apparatus. In this manner, untimely breaking of the telephonecircuit through the switch b c d due to oscillations of the slide blockh of the centrifugal governor when the motor spring no longer 1"supplies a suflicient torque, are avoided.

The rated speed of the whole apparatus is regulated through the mediumof the lever 51 (Fig. 4) which limits the up stroke of the slide blockit of the governor 21 through a stop 52 at the end of the lever 51.

When the apparatus is arranged to warn the shown in sectional elevation,includes three sets 2' of two dialling cams 24 separated by the insertmembers29. Each set of cams is separated by frusto-conical insertmembers 55, the larger base of each of which faces upwardly.

The pinion 9 driving the shaft 25 of the dialling device is mountedon asleeve 56 freely rotatable in cylindrical bearings of the support 26 ofthe dialling device. The pinion 9 carries on its lower face one ormoredriving fingers 57, while the spindle o! the dialling device hasmounted on an appropriated collar 58 another driving finger 59 inalignment with fingers 57.

The shaft 48 of the stopping mechanism is extended below the ratchetwheel 47 to receive the collar 60 whose angular position on the spindleis controlled by a needle screw. On the collar 60 v are assembled thecams 54 controlling the switch 0 p (Fig. 13) and the cam 61 controllingthe movement of the dialling device n through the medium of a clutchlever 62 pivoted on the spindle 63.

The repeat call signaling apparatus operates as follows: When the fallof the shutter 1'7 (Fig. '7) has set the apparatus in motion through themeans previously described, the adjustable screw 64 of the lever 62encounters the first cam 61 controlling the dialling device 11. after atime interval determined by the position of the driving fingers 46 ofthe ratchet 4'7 on the drum 1. At this moment, the end 65 of the lever62 will raise the spindle 25 of the dialling device n, one of thedriving fingers 57 of the pinion 9 will meet, asit rotates, thecorresponding finger 59 of the clutch disc 58 of the spindle 25. Thespindle 25 will then start rotating, driving, through the meanspreviously described, the dialling device n, for a length of timedetermined by the length of the cam 61 and sufficient to assure dialingof the digits, two in the example illustrated, of the first stationcalled.

As the teeth of dialling cams 24 pass successively under the push button23 of switch e f 9 (Fig. 13), the switch is actuated in the same manneras previously described for the case of a single call. When the firsttelephone number has been called, the cam 61 releases the screw 64,while the spring 66 fixed on the upper plate 11 of the apparatus thruststhe spindle 28 downwardly into its position of rest. The dialling devicewill then be locked, the push button 23 on the switch e f g droppinginto the groove provided by the first frusto-conical insert 55. Thiscauses the switch contacts 9 f to remain closed and the con-,

tacts f e to be opened, thereby connecting the microphone pick-up m toline It for transmitting the alarm message to the first station called.

The ratchet wheel 47 continuing its intermittent helicoidal motion, willelevate with it the collar 60 until the screw 64, having traversed thefirst insert blank 67, encounters the first cam 54. When. in itsmovement. the cam 54 encounters the push button 53 of the switch 0 p,the telephone circuit is broken at o p and the first call willterminate. This first break of the circuit will last for a timecorresponding to the length of the cam 54, then the telephone circuitwill be established at o 11. After a time interval determined by thethickness of the second insert piece 67 and the angular position of thecollar 60, the second cam 61 will encounter the screw 64 causing thedialling device to be moved a second time in the manner described, tomake the second call. The second conical insert member 55 will then opencontacts e f to connect the pickup m to line is for transmission of thealarm message to the second station. This sequence of operations will berepeated in the same manner for the third or any greater number ofcalls.

The duration of the last'call islregulated by the screw 68, the end 69of which will act as a stop for the advancing head 56 of the spindle 48,to prevent further rotation of the drum 1. Thereupon contacts b d ofswitch b c 11 will open to disconnect the alarm apparatus from line It,

which will then be reconnected to the subscribers station 21 throughswitch contacts b c.

We claim: V

1. In an alarm system in combination, an automatic exchange telephoneline, a protective circuit, a motor, means responsive to a disturbanceof said circuit for starting said motor, impulse transmitting meansadapted to dial several stations responsive to said motor forautomatically connecting said line to a particular station, aphonographic device actuated by said motor to send an alarm message oversaid line subsequent to said station selection, said device having anonacoustical pick-up for silent actuation, means producing continuousrepetition of said phonographic message so long as said motor isoperative and means abruptly stopping the motor to terminate said alarmafter a predetermined plurality of message repetitions.

2. In combination, an automatic exchange telephone line extending to'adial telephone set, an alarm system separate and distinct from said setcomprising a protective circuit, a motor, means responsive to a(fisturbance of said circuit for starting said motor, and means operatedby said motor consisting of, a switch centrifugally actuated todisconnect saidset from said line and to connect said alarm systemthereto, cam actuated multiple digit dialling means for automaticallyconnecting said line to a particular station, a phonographic device forsending an alarm message over said line subsequent to dialing, meansproducing continuous repetition of said message while said motor isoperative, and means stopping said motor after a predetermined number ofmessage repetitions.

3. In an alarm system in combination, an automatic exchange telephoneline, a protective circuit, a motor, means responsive to disturbance ofsaid circuit for starting said motor, and means operated by said motorcomprising, cam actuated dialing means for connecting said line to aparticular station, said means including a cam disc for each digit ofthe called station number, a phonographic device adapted to send analarm message over said line, means connecting said device theretosubsequent to said station selection thereby to prevent transmission offalse impulses during dialing, and means abruptiy stop ping said motorto terminate the alarm after a predetermined alarm interval.

4. In an alarm system in combination, an automatic exchange telephoneline, a protective circuit, a motor, means responsive to disturbance oi.said circuit for starting said motor, and means operated by said motorcomprising, cam means actuating impulsing means for connecting said lineto a particular station, said cam means including a drum bearing aseparate cam disc for each digit of the called number, means forimparting helicoidal motion to said drum whereby said discs operatesuccessively on said impulsing means, a phonographic device adapted tosend an alarm message, means operatively connecting said device to saidline subsequent to the station selection, and means abruptly stoppingsaid motor to terminate the alarm.

5. In an alarm system in combination. an aualarm message to each saidstation, and means for automatically stopping said motor thereafter.

6. In an alarm system in combination, an automatic exchange telephoneline, a protective circuit, a motor, means'responsive to a disturbanceof said circuitfor starting said motor, impulse transmitting meansresponsive to said motor for automatically connecting said line insequence to a plurality of prearranged stations, phonograph meansactuated by said motor to send an alarm message to each said station,means for automatically stopping said motor thereafter, and meanspreventing. said message transmission during selection of said stationsthereby to prevent transmission of false dialing impulses.

7. In combination with an automatic exchange telephone line, an alarmsystem comprising, a protective circuit, a motor, means responsive todisturbance of said circuit for starting said motor, a phonographicdevice adapted to send an alarm message over said line, impulsing meansadapted to connect said line in sequence to a plurality of stations, andclutch means responsive to said motor for causing said impulsing meansto select a station and for thereafter connecting said phonographicdevice to said line thereby to transmit the alarm message, said clutchmeans being subsequently operative similarly to connect said line toeach of the remaining stations.

8. In an alarm system in combination, an automatic exchange telephoneline, a protective circuit, a motor, means responsive to disturbance ofsaid circuit for starting said motor,aphonographic device adapted tosend an alarm message over said line, impulsing means for automaticallyconnecting said line in sequence to a plurality of stations, cam drivenclutch means intermittently actuated by said motor for causing saidimpulsing means to select said stations, said clutch means releasing foran interval following each said selection to permit transmission of thealarm message, and means stopping said motor following transmission ofthe alarm to all stations.

9. In an alarm system in combination, an auto-' matic exchange telephoneline, a protective circuit, a motor, means responsive to a disturbanceof said circuit for starting said motor, and means operated by saidmotor comprising, a phonographic device adapted to send an alarm mes--means for operatively associating said phonographic device with saidline between successive stations selection for transmission of the alarmmessage to each.

10. In combination with a telephone line extending to a central oflice,an alarm system comprising, a protective circuit, a motor, meansresponsive to disturbance of said circuit for start ing the motor, andmeans actuated thereby for signaling the central oflice and thereaftersending an alarm message over said line, and a rotatable memberhelicoidally advancing to abutment with a fixed member to stop saidmotor after a predetermined interval of rotation.

11. In combination with a line connecting a telephone set with a centraloflice, an alarm system distinct from said set comprising, a protectivecircuit, a motor, means responsive to disturbance of said circuit forstarting the motor, and means actuated thereby consisting of, acentrifugally actuated switch for disconnecting said set and connectingthe alarm system to said line, means for signaling the central officeand for thereafter sending an articulate alarm message over said line,and means abruptly stopping the motor after a predetermined interval ofrotation to prevent transmission of false dialing impulses.

12. In combination with an automatic exchange telephone line, an alarmsystem comprising, a protective circuit, a motor means responsive to thedisturbance of said circuit for starting the motor, a phonographicdevice operated thereby and having an electrical output path adapted tosend an alarm message over said line impulsing means for automaticallyconnecting said line to a particular station, said impulsing means beingoperative to short circuit said output path during station selection,thereby to prevent false dialing impulses and to thereafter remove saidshort circuit for transmission of the alarm message, and meansautomatically opening said output path following transmission of saidmessage thereby to release said station and terminate the alarm.

13. In combination with an automatic exchange telephone line, an alarmsystem comprising a protective circuit, a motor, means responsive to adisturbance of said circuit for starting the motor, a phonographicdevice operated thereby and having an electrical output path adapted tosend an alarm message over said line, impulsing means for automaticallyconnecting said line in sequence to a plurality of preselected stations,said impulsing means being operative with respect to each station, toshort circuit said output path du'ring station selection, thereby toprevent false dialing impulses and to thereafter remove said shortcircuit to permit transmission of the alarm message, and meansautomatically opening said output path following transmission of eachsaid message thereby to release each station and permit selection of thesucceeding station, and means abruptly stopping said motor followingtransmission of the alarm message to all said stations 14. In an alarmsystem in combination, an automatic exchange telephone line, aprotective cir- 25 cuit, a motor means responsive to electricaldisturbance of said circuit for starting said motor, dialling meansoperated by said motor including a helicoidally advancing drum providedwith spaced cam discs successively actuating impulsing means 0 forautomatically connecting said line to a particular station, aphonographic device for sending -an alarm message over said line, and aswitch actuated upon advance of said drum for opera- .tively connectingsaid phonographic device to said 5 line subsequent to dialling.

15. In an alarm system in combination, an automatic exchange telephoneline, a protective circuit, a motor, means responsive to disturbance ofsaid circuit for starting the motor, dialling no phonographic device tosaid line for an alarm interval following each station selection. 15%

dialling means to select a station, and for thereafter rendering saiddialling means inoperative while connecting said phonographic device tosaid line for transmission of the alarm message, and cam controlledswitching means adapted to open the line to release each stationsubsequent to transmission of the alarm message thereby to permitselection of the succeeding stations.-

' JEAN EDOUARD TUSCHER.

MARCEL SPIRO.

DISCLAIMER 1,974,551.Jean Edouard Tuscher, Petit Ivry, and Marcel Spiro,Paris, France. AUTOMATIC TELEPHONE SIGNALING APPARATUS. Patent datedSeptember 25, 1934. Disclaimer filed March 6, 1937, by the assignee,Signaphone Corporation of America. Hereby enters this disclaimer toclaim 12 of said Letters Patent.

[Ofiicial Gazette April 20, 1937.]

